Honors Biology Unit 1A Vocabulary

Front

Atom

Back

The basic unit of matter

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Nucleus

Back

The center of an atom that contains both protons and neutrons.

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Neutron

Back

No charge

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Proton

Back

Positively charged particle

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Electron

Back

Negatively charged particle

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Element

Back

A pure substance that consists entirely of one type of atom

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Atomic number

Back

Number of protons; number of electrons

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Mass number

Back

Number of protons + number of neutrons

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Isotope

Back

Atoms of the same element that differ in the number of neutrons they contain

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Compound

Back

Substance formed by the chemical combination of two or more elements in definite proportions. Ex: H2O and NaCl